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Registered Member #1730
Joined: Thu Oct 02 2008, 08:12AM
Location: Poland
Posts: 35
My coil didn't wanted to work on 20V, and I gues that it could be the same on 12V, but actually it is working on 40V. But on internet there is some projects of SSTC working on 12V. Most of SSTC powered by car supply are working on 12V or 24V. Projects of ISSTC are rether powered by thil low voltage.
Registered Member #1533
Joined: Wed Jun 11 2008, 02:13PM
Location: ReykjavÃk, Iceland
Posts: 46
The secondary voltage depends on the primary current. So for greater spark length you need to make the resistance at the resonant frequency as low as you can. This can be accomplished by matching the resonant frequency on the primary with that of the secondary. You could even try adding a variable capacitor. ;)
Registered Member #950
Joined: Sat Aug 11 2007, 02:11PM
Location:
Posts: 8
I don't seem to be pulling enough current it seems. I'm using a self resonant full bridge of IRGB2060PD1 (600V, 40A). Rce is shown as 158 miliohms on the datasheet. I guess this is quite a large resistance. At any time the lowest possible resistance between the PSU and the primary coil would be 316miliohms, so at 12V, the peak current could be no more than 38A. It's not running at anywhere near that though.
Registered Member #1533
Joined: Wed Jun 11 2008, 02:13PM
Location: ReykjavÃk, Iceland
Posts: 46
Perhaps the IGBTs aren't switching fast enough. At what frequency are you running them and what's the frequency rating of those devices (google yielded no results for IRGB2060PD1)? Have you tried looser coupling?
Maybe you should post drawings of your circuit and perhaps even pictures of your setup.
Registered Member #950
Joined: Sat Aug 11 2007, 02:11PM
Location:
Posts: 8
I think there's something wrong with my circuit... I've attatched a simplified version.
I noticed that when I have no load connected, I can touch the antenna and the circuit will oscilate at 50Hz which is becasue it is picking up mains frequency from my body. So that seems to be working.
But when I connect the load (primary coil) the circuit is osilating but it seems so be just at 300 hertz (approx). I disconnected the antenna and it makes no difference.
It must be picking it up internally but i'm not sure where from. The whole circuit runs from the same battery. There is a large choke between the supply and the control electronics and a decoupler with each IC.
There is a MOV between the gate and emitter of each IGBT, and als between antenna and ground
I'm using a CMOS switch to connect and disconnect the comprator output to the TC4428
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12V primary voltage SSTC's
